import fs from 'fs';

fs.writeFile('./bbb.txt','hello world',{
    encoding:'utf-8',
    flag:'a+'
},(err)=>{
    console.log('写入文件结果:',err);
});
const writeStream=fs.createWriteStream('./ccc.txt',{flags:'a'});

writeStream.on('open',(fd)=>{
    console.log('文件被打开',fd);
});
writeStream.write('conderwhy');
writeStream.write('aaaaa');
writeStream.write('bbbb',(err)=>{
    console.log("写入完成:",err);
});

writeStream.on('finish',()=>{
    console.log('写入完成了');
});
writeStream.on('close',()=>{
    console.log('文件被关闭~');
});
writeStream.end('哈哈哈哈哈');